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    <script>
        //1,翻转数组
        var arr = [1, 2, 3];
        arr.reverse();
        console.log(arr);
        //2.数组排序（冒泡排序）
        var arr1 = [2, 4, 1, 55, 3];
        arr1.sort(function(a, b) {
            return a - b; //升序 的顺序排列
            return b - a; //降序 的顺序排列
        });
        console.log(arr1);
    </script>
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